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Subject
- Geology20
- Land use, Rural14
- Roads8
- Mines and mineral resources7
- Administrative and political divisions5
- Wells5
- Hydrogeology4
- Outdoor recreation4
- Sedimentary basins4
- Administration3
- Geology, Structural3
- Rafting (Sports)3
- Rivers3
- Continental shelf2
- Earthquakes2
- Faults (Geology)2
- Geodatabases2
- Industries2
- Population2
- Soils2
